ANSI INCITS 514-2014 Information Technology C SCSI Block Commands - 3 (SBC-3).pdf
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1、American National StandardDeveloped byfor Information Technology SCSI Block Commands - 3 (SBC-3)INCITS 514-2014INCITS 514-2014INCITS 514-2014American National Standardfor Information Technology SCSI Block Commands - 3 (SBC-3)SecretariatInformation Technology Industry CouncilApproved May 12, 2014Amer
2、ican National Standards Institute, Inc.AbstractThis standard specifies the functional requirements for the SCSI Block Commands - 3 (SBC-3) command set. SBC-3 permits SCSI block logical units such as rigid disks to attach to computers and provides the definition for their use.This standard maintains
3、a high degree of compatibility with the SCSI Block Commands (SBC-2) command set, INCITS 405-2005, and while providing additional functions, is not intended to require changes to presently installed devices or existing software.Approval of an American National Standard requires review by ANSI that th
4、erequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgement of the ANSI Board ofStandards Review, substantial agreement has been reached by directly andmaterially affected interests. Substantial agr
5、eement means much more thana simple majority, but not necessarily unanimity. Consensus requires that allviews and objections be considered, and that a concerted effort be madetowards their resolution.The use of American National Standards is completely voluntary; theirexistence does not in any respe
6、ct preclude anyone, whether he has approvedthe standards or not, from manufacturing, marketing, purchasing, or usingproducts, processes, or procedures not conforming to the standards.The American National Standards Institute does not develop standards andwill in no circumstances give an interpretati
7、on of any American NationalStandard. Moreover, no person shall have the right or authority to issue aninterpretation of an American National Standard in the name of the AmericanNational Standards Institute. Requests for interpretations should beaddressed to the secretariat or sponsor whose name appe
8、ars on the titlepage of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, orwithdraw this standard. Purchasers of American Nat
9、ional Standards mayreceive current information on all standards by calling or writing the AmericanNational Standards Institute.American National StandardPublished byAmerican National Standards Institute, Inc.25 West 43rd Street, New York, NY 10036Copyright 2014 by Information Technology Industry Cou
10、ncil (ITI)All rights reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwise,without prior written permission of ITI, 1101 K Street NW, Suite 610, Washington, DC 20005. Printed in the United States of AmericaCAUTION: The developers of this st
11、andard have requested that holders of patents that may berequired for the implementation of the standard disclose such patents to the publisher. However,neither the developers nor the publisher have undertaken a patent search in order to identifywhich, if any, patents may apply to this standard. As
12、of the date of publication of this standardand following calls for the identification of patents that may be required for the implementation ofthe standard, no such claims have been made. No further patent search is conducted by the de-veloper or publisher in respect to any standard it processes. No
13、 representation is made or impliedthat licenses are not required to avoid infringement in the use of this standard.iDedicationThis standard is dedicated to the memory of Mark S. Evans, who was the editor from 2007 to 2013. Mark was an active member of the T10 INCITS Technical Committee since October
14、 1995 where he served as the T10 Vice-Chair from November 2007. In addition to being an editor and vice-chair Mark contributed in excess of 100 proposals to the various T10 standards. In many ways the fabric of what is currently looked on as “the SCSI standards“ is as a result of Marks proposals and
15、 his many other contributions.Mark spent his working career working at various storage related companies in California including Komag, Quantum, Maxtor, and Western Digital. Mark lived most of his life in Sunnyvale, California and recently moved to Waldport, Oregon. He enjoyed the outdoors, working
16、in his yard, playing guitar, and traveling. He spent most of his free time volunteering in service organizations.iiContentsPageContents iiTables .xFigures xvForeword xviIntroduction .xxSCSI standards family xxi1 Scope. 12 Normative references. 12.1 Normative references overview 12.2 Approved referen
17、ces 12.3 References under development . 13 Definitions, symbols, abbreviations, keywords, and conventions 23.1 Definitions, symbols, abbreviations, keywords, and conventions Introduction . 23.2 Definitions. 23.3 Symbols 93.4 Abbreviations 93.5 Keywords 103.6 Editorial conventions 113.7 Numeric and c
18、haracter conventions . 113.7.1 Numeric conventions 113.7.2 Units of measure. 123.8 State machine conventions 134 Direct access block device type model 144.1 Direct access block device type model introduction . 144.2 Direct access block device type model. 154.2.1 Direct access block device type model
19、 overview 154.2.2 Logical block access command types. 154.2.3 Logical block access operation types . 154.3 Media examples . 154.3.1 Media examples overview. 154.3.2 Rotating media 164.3.3 Memory media 164.4 Removable media. 164.5 Logical blocks. 174.6 Physical blocks. 184.7 Logical block provisionin
20、g. 224.7.1 Logical block provisioning overview 224.7.2 Fully provisioned logical unit . 234.7.3 Logical block provisioning management . 234.7.3.1 Logical block provisioning management overview 234.7.3.2 Resource provisioned logical unit 234.7.3.3 Thin provisioned logical unit 244.7.3.4 Unmapping LBA
21、s 244.7.3.4.1 Processing unmap requests 244.7.3.4.2 Unmap operations . 244.7.3.4.3 WRITE SAME command and unmap operations 254.7.3.5 Autonomous LBA transitions . 264.7.3.6 Thin provisioned logical unit resource exhaustion considerations 264.7.3.7 Logical block provisioning thresholds 264.7.3.7.1 Log
22、ical block provisioning thresholds overview . 26iii4.7.3.7.2 Logical block provisioning armed decreasing thresholds 274.7.3.7.3 Logical block provisioning armed increasing thresholds 284.7.3.7.4 Logical block provisioning threshold notification 294.7.4 LBP (logical block provisioning) state machine.
23、 294.7.4.1 LBP state machine overview . 294.7.4.2 LBP state machine for thin provisioned logical units supporting anchored LBAs 304.7.4.3 LBP state machine for thin provisioned logical units not supporting anchored LBAs 304.7.4.4 LBP state machine for resource provisioned logical units. 314.7.4.5 Pe
24、rforming read operations with respect to logical block provisioning 314.7.4.6 LBP1:Mapped state. 334.7.4.6.1 LBP1:Mapped state description. 334.7.4.6.2 Transition LBP1:Mapped to LBP2:Deallocated . 334.7.4.6.3 Transition LBP1:Mapped to LBP3:Anchored . 334.7.4.7 LBP2:Deallocated state. 334.7.4.7.1 LBP
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